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Artur Rymarz
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Apr 24, 2018
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| // | ||
| // SnowflakeSpeed.swift | ||
| // Demo | ||
| // | ||
| // Created by Artur Rymarz on 24.04.2018. | ||
| // Copyright © 2018 Artrmz. All rights reserved. | ||
| // | ||
|
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||
| import Foundation | ||
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| public enum SnowflakeSpeed { | ||
| case slow, medium | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // | ||
| // SnowflakesAnimation.swift | ||
| // Demo | ||
| // | ||
| // Created by Artur Rymarz on 24.04.2018. | ||
| // Copyright © 2018 Artrmz. All rights reserved. | ||
| // | ||
|
|
||
| import UIKit | ||
|
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| public extension UIView { | ||
| /// Adds snowflakes to your view | ||
| /// | ||
| /// - Parameters: | ||
| /// - colors: colors of your snowflakes (default: [.white]) | ||
| /// - amount: amount of snowflakes for each color (default: 3) | ||
| /// - speed: soeed of animation (default: .medium) | ||
| /// - clipToBounds: should view be clipped to bounds (default: true) | ||
| func addSnowflakes(with colors: [UIColor] = [.white], amount: Int = 3, speed: SnowflakeSpeed = .medium, clipToBounds: Bool = true) { | ||
| self.clipsToBounds = clipToBounds | ||
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| let snowflakeEmitter = CAEmitterLayer() | ||
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| snowflakeEmitter.emitterPosition = CGPoint(x: center.x, y: -96) | ||
| snowflakeEmitter.emitterShape = kCAEmitterLayerLine | ||
| snowflakeEmitter.emitterSize = CGSize(width: frame.size.width, height: 1) | ||
|
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| var cells = [CAEmitterCell]() | ||
| colors.forEach { color in | ||
| let cell = makeEmitterCell(color: color, amount: amount, speed: speed) | ||
| cells.append(cell) | ||
| } | ||
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| snowflakeEmitter.emitterCells = cells | ||
| layer.addSublayer(snowflakeEmitter) | ||
| } | ||
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| private func makeEmitterCell(color: UIColor, amount: Int, speed: SnowflakeSpeed) -> CAEmitterCell { | ||
| let cell = CAEmitterCell() | ||
| cell.birthRate = Float(amount) | ||
| cell.lifetime = 7.0 | ||
| cell.lifetimeRange = 0 | ||
| cell.color = color.cgColor | ||
| let velocity = CGFloat(arc4random_uniform(150) + 150) | ||
| switch speed { | ||
| case .slow: | ||
| cell.velocity = velocity / 3 | ||
| default: | ||
| cell.velocity = velocity | ||
| } | ||
| cell.velocityRange = CGFloat(arc4random_uniform(20) + 30) | ||
| cell.emissionLongitude = CGFloat.pi | ||
| cell.emissionRange = CGFloat.pi / 4 | ||
| cell.spin = CGFloat(arc4random_uniform(2) + 1) | ||
| cell.spinRange = CGFloat(arc4random_uniform(5) + 1) | ||
| cell.scaleRange = 0.5 | ||
| cell.scaleSpeed = -0.05 | ||
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| cell.contents = UIImage(named: "snowflake")?.cgImage | ||
| return cell | ||
| } | ||
| } |